Let Y denote the number of ""heads"" that occur when two coins are tossed. Derive the probability distribution of Y. Derive the cumulative probability distribution of Y. Derive the mean and variance of Y.

Acertain standardized? test's math scores have a? bell-shaped distribution with a mean of 520 and a standard deviation of 105. complete parts? (a) through? (c)

James wants to promote his band on the internet. site a offers website hosting for $4.95 per month with a $49.95 startup fee. site b offers website hosting for $9.95 per month with no startup fee. for how many months would james need to keep the website for site a to be a better choice than site b? will mark the

What is the difference between the equations of a vertical and a horizontal line?